Chain skipping or something else?
 

When I ride my 2018 Domane SL 5 Disc I notice that occasionally when I go from coasting to pedaling I'll hear and feel some kind of noise/feeling from the chain on the chain ring that suggests that the chain has not been seated correctly on the chain ring. This will only happen once after I have shifted the front deraileur. Once it happens, it doesn't happen again until I shift. Oddly enough, it doesn't happen immediately after I shift but sometime down the road after I coast and then resume pedaling. I don't think it's a chain skip because I do not feel the pedals moving forward. I've checked the chain length with my Park tool and it is not stretched. What the heck is going on here? Can the deraileur be misadjusted so that the chain does not seat properly on the chain ring?

Do you continue pedaling until the front shift is "complete"?

Else, sounds like the Free Hub isn't engaging promptly.

Have someone ride beside you and observe.

I agree it sounds like the freehub may be "pushing" the chain. Does the chain fall down on the chainstay ?

What kind of wheels are you running

Mark Petry
Bainbridge Island, WA USA

Standard Shimano 105 set up on the bike. The noise/feeling seems to be coming from the chainring. My bike has a compact double. Wheels are what the bike came with,
bontrager. The chain does not hit the chain stay. Everything on the bike is as it was when I bought it, but the problem did not occur when the bike was first bought. At first I though of chain stretch, but the Park tool says no.

Noises on a bike can travel and seem to be coming from one spot only to be found emanating from another location. Even the tensioned chain can be a "path".

Are you able to replicate this when on a trainer stand? If so it will be far easier to show a shop what's going on. Chain/teeth noises have a handful of different sounds and an experienced ear can quickly narrow things down.

My speculation from afar is that you're experiencing a chain link plate catching on a tooth, perhaps a connecting link? Just enough snag/catch to produce a hard click/clack as the link fully seats/meshes with the tooth. Much more common to the cog set then the rings. I tend to run my rear SIS adjustment (what most will say is cable "tension") on the down shift side of the center (what most would call a tighter cable). But if too much adjuster is used the chain catching thing will happen more frequently. Since I like the crisper down shifting with a "tighter" cable I put up with the infrequent catch that I described.

Of course do due diligence and check everything out. If for the reason to know the state of wear of your components, their adjustments and that the fasteners are properly tightened. Andy